Apparatus for the manufacture of building blocks



Dec. 24, 1946. LE|PQLD r 2,413,109

APPARATUS FOR THE MANUFACTURE OF BUILDING BLOCKS Filed April 11, 1941 2Sheets-Sheet 1 Z" mvsmon EUGENE 1.51m

ATTORNEYS BLOCKS 1946- E. LEIPOLD ETAL TUBE OF BUILDING APPARATUS FORTHE MANUFAC Filed April 11, 194] 2 Sheets-Sheet 2 L D s Rm W Z M v 6 y,me a EN 5 up. 55%

Patented Dec. 24, 1946 APPARATUS FOR THE MANUFACTURE OF BUILDING BLOCKSEugene Leipold and Bruno Garnl, Milwaukee, Wis.

Application April 11, 1941, Serial No. 388,008

Claims.

This invention relates to improvements in apparatus for the manufactureof building blocks. This is a continuation in part of our application224,964 flied August 15, 1938, and entitled Building blocks.

It is the primary object of the present invention to provide a novel andimproved apparatus for the manufacture of building blocks of concrete,preferably ornamentally faced, which will have the requisite hardnesswithout requiring that each block be left to harden in the mold in whichit is formed.

In the past, the manufacture of concrete building blocks has presented adilemma. For proper setting of the cement used in the construction ofsuch blocks to produce a satisfactorily hard and waterproof block, it isnecessary to use a very considerable amount of water. Where the amountof water used is adequate it has not been possible to remove the formfrom the block and consequently the number of forms required to makeblocks in any substantial quantities has been prohibitively large. Onthe other hand, if the mix was made sufiiciently dry to permit the formto be removed. the block would neither be satisfactorily hard norwaterproof. The present invention solves the problem of manufacturing alight weight, very hard, and very waterproof block, preferably of cinderconcrete, through the use of the novel apparatus and method hereinafterto be disclosed.

Another important object of the invention has to do with the surfacingof the block. In accordance with the present invention the sides of theform are removed from the freshly cast mix, leaving the block standingon the bottom board or pallet. In accordance with the preferred practiceof the invention, that portion of the block immediately adjacent thepallet is made with an ornamental aggregate which gives to the finishedblock face the appearance of cut stone. In the prior art much difficultyhas been experienced due to adhesion between the finished surface of theblock and the pallet, with the result that it has been common practicein the prior art to finish the top face rather than the bottom face ofthe block. For many reasons this is unsatisfactory and we have found inthe present invention a satisfactory means of finishing the bottom faceof the block without any adhesion of such face to the pallet and withoutany of the difllculties heretofore experienced in this connection.

Other important objects of the invention have to do with thesimplification and improvement of the forms used in the manufacture ofconcrete blocks and in vibrating machines with which said forms interactduring the casting of the blocks. It is our purpose to provide novel andimproved forms each including integrally connected side and end wallsseparable from other side and end wall units at diagonally oppositecomers of the block and readily adaptable for the production of blocksof difiering sizes and shapes by merely supplementing the basic formsused for the production of all blocks. Thus, we are able to makestandard blocks, corner blocks, half blocks, and quarter blocks, all inthe same fundamental apparatus.

It is our further purpose to provide a novel and improved organizationin which the forms and the mix therein contained may be subjectedmomentarily to vibration during the casting of successive blocks by anarrangement in which each form and its contents may be loweredmomentarily onto a surface which is in continuous vibration.

A further object of the invention is to provide a novel and improvedapparatus for completing the manufacture of each block by washing theface thereof and removing a superficial coating which is deliberatelymade non-hardening in accordance with the method hereinafter to bedisclosed.

Another object is generally to simplify and improve the construction,arrangement and operation for one or more of the purposes mentioned, andstill other objects will be apparent from the specification.

In the drawings:

Fig. l is a view in front elevation of apparatus used in the molding ofconcrete blocks.

Fig. 1a is a detail view of one of the vibrating weights as it appearsin side elevation.

Fig. 2 is a view in side elevation of a portion of Fig. 1 as it appearsin the sectionindicated at 2-2 in Fla. 1.

Fill. 3 is a plan view of the block washing apparatus.

Fig. 4 is a side elevation of the apparatus shown in Fig. 3.

Fig. 5 is a view in perspective showing a completely assembled form forthe production of standard blocks.

Fig. 6 is a view in perspective showing in partially separatedrelations. several of the component parts of the form illustrated inFig. 5.

Fig. 7 is a fragmentary detail in perspective showing the introductionof auxiliary parts into a form such as that illustrated in Figs. 5 and 6to produce a finished end on the block to be cast in such a form.

Fig. 8 is a view in perspective of a standard block such as may be castin the form of Fig. 5.

Fig. 9 is a view in perspective of a comer block such as may be cast ina form of the type shown in Fig. '7.

Like parts are identified by the same reference characters throughoutthe several views.

In accordance with the present invention the side and end formstructures shown in Figs. 5, 6, and '7 are assembled upon a successionof pallets in corresponding to the number of blocks which will be inprocess at any given time. Each pallet comprises a board preferablyprovided with cleats at II. The face of each pallet is preferably markedout in any desired pattern with ribs I! which form in the completedblock grooves simulating mortar Joints between dressed stone blocks. Thepreferred practice of the invention produces a block having anornamental face of differing colors or textures or both, so that a wallmade of the improved blocks closely simulates a wall of natural dressedstone.

Removably associated with each of a succession of pallets, are the formmembers best shown in Figs. 5 and 6. These are identical with each otherand each comprises an end plate It welded or otherwise integrally joinedto a single side plate IS. The end plate I5 is made to extendtransversely of the pallet in while the side plate I5 is flushtherewith. Welded to the under surface of side plate It is an angle armI! which abuts the side of the pallet and is provided with a finger atl8 for resting on top of the pallet to support in a horizontal positionthat end of the side plate It which is not connected with the end plateii to receive support therefrom.

Each of the end plates l5 has welded to its outer face a finger l9receivable into a notch 20 at the end of side plate ii of theco-operating identical unit to assure proper registration. A block at 2|on the free end of each side plate It engages about the outer surface ofthe contiguous end plate as shown in Fig. 5 to sustain the outwardthrust of the contents of the mold.

Each of the end plates is provided at 22 with outstanding ears on itsouter face. Pivoted between such ears is a latch lever 23 to the end ofwhich is swivelled a cam 24 having an operating handle 25. The lever 23is received into a notch 26 in the end of the side plate i6 of theadjoining unit, thereby bringing the cam into registry with the outersurface of such unit so that manipulation of the cam lever 25 willresult in drawing the end of each form unit into close fitting pressureengagement with the contiguous side of the co-operating unit.

As clearly shown in Fig. 5, the two cams 24 located at diagonallyopposite corners of the resulting mold, securely anchor the co-operatingunits together to provide a continuous mold upon the pallet l whereofeach unit furnishes one side and one end.

The end plates ii of the mold units are normally provided with inserts30 which are held thereto by screws 3| to mold the recesses in the endsof the building block. When it is desired to make a corner block. one orboth of these inserts 3|! may be completely removed and the parts shownin Fig. '7 may be substituted. Immediately adjacent the end wall i is aninserted plate 32 to provide the finished surface for molding the smoothend of a corner block. The plate 32 is provided with laterally dependingfingers 4 83 which extend over the side walls of the mold and engage in.the grooves I4 thereof.

In order to permit a different min to be inserted at the end face of theblock from that used to make up the body thereof, a partition plate I!is introduced, this plate having similar fingers at ll receivable intothe groove Tl in the respective side plates of the mold units near theends thereof.

Each of the side plates it of the form units above described, isprovided with three openings at lll which are of elongated form andmounted at their ends as clearly shown in Figs. 6 and '7. In theassembled form. units the openings of the respective side plates aredirectly opposite each other. Into these opposite openings we introducefrom the exterior of the mold a set of core forms 40 which arepreferably identical and fit closely to the margins of the side platesit about such openings. Each of the core forms I may comprise a hollowcan of metal having a cross section accurately corresponding to theshape of the openings 38 into which it is receivable, as shown in Fig.5. Secured across the ends of the several cams is a bar I having ahandle 42 by means of which the several core forms may be manipulated asa single unit.

In accordance with the method hereinafter to be described, we providefor the vibration of the mix in the forms. Upon a frame comprising anysuitable number of legs 44 connected by stretchers 45, we mount one ormore tables 46 connected by stretchers 41. Cushions of rubber or thelike at 8 permit the table or tables 48 to vibrate freely with respectto the frame. To hold the table structures to the frame whileaccommodating such vibration, we provide guide openings at I! and 50 forrods 5| upon which compression springs 52 and I3 engage stretcher 41 ofthe table, thereby holding the table upon cushion l8 while accommodatingvibratory movement of the table.

Each table 46 may comprise simply a plank disposed transversely betweenthe stretchers l1 and provided on its under surface with bearings at 8|for vibrating shaft 55 upon which a weight 56 is eceentrically disposed.When the shaft 55 is driven by pulley 51 from motor 58, the eccentriomounting of the weight 56 produces the desired vibration of the table46.

The vibration, if too extensive, will tend to disintegrate theapparatus. If too fine (occurring within limits unduly narrow), it willnot produce the desired result. Therefore, while the specific factorsare not critical, there is a critical range within which the rate ofrotation, the mass of the eccentric, and the eccentricity of such mass,must be kept in relation to the load to be vibrated. In practice, weprovide on each shaft 55 two eccentrics, each adjustable as to itseccentricity upon shaft 55 and determine their correct position by trialand error. In our commercial apparatus, shaft 55 is rotated atapproximately 3600 R. P. M. and each eccentric 56 comprises a pair ofdisks BBI and 582 which are 6 in diameter and thick. Each is providedwith an arbor ofl' center and each disk is provided with an arcuate slotas shown at 563 in Fig. la. A bolt 584 passing through registeringportions of the arcuate slots of the respective disks, holds them in anydesired position of relative angular adjustment about shaft 55. If thetwo disks are completely in registry, their eccentricity will becumulative. If they are offset at degrees, their eccentricity will bewholly neutralized and balanced. At some intermediate point the desiredvibrating effect will be produced in such a degree that it will not bedestructive of the apparatus and yet will not be so fine that thematerial will not be packed in the molds. In actual practice disks ofthe character described have been set at such relative positions as tobe rela tively oil'set angularly approximately 70".

In referring to the use of two such disks on each shaft 55, we havereference to a commercial machine in which molds and their contents arebeing vibrated at each end of the table plank 48 upon which shaft I ismounted. Naturally, where two composite disks are used on the shaft thepairs of plates comprising the two disks will normally be adjusted tothe same angular offset so that their net eccentric effect will bealike.

Similarly, if other table planks 4B and other shafts 55 are mounted onthe same structures H, the net vibrating eifect of the eccentric weightsused thereon should be synchronous and cumulative so that the weightswill not work against each other.

The table It has arms 60 projecting from the stretcher 41 in mutuallyspaced relation as clearly appears from Fig. 1 and Fig. 2. Between sucharms is a pedestal 6| having a base plate 62 securely fixed to thefloor. The pedestal preferably comprises an upright channel providedinternally with cross webs at 63 and 54 apertured to provide bearings inwhich is guided a post 65 supported in a, normally elevated positiondetermined by a stop 66 at its lower end, the post being biased to saidupper normal position by strong tension springs 61 best shown in Fig. 1.Projecting laterally from post 65 is a foot pedal 68 which may bedepressed by the operator at will to lower the post in the pedestal SI.

On the upper end of post 65 is a head comprising a cross bar 69 andparallel supporting members which are receivable beneath the pallets illto hold each successive pallet and the form assembled thereon in asuitable position for filling such form with mix. To facilitate thefilling operation we preferably provide a superstructure at 16 carryinga hopper 11 having a 46 discharge spout at 18 which immediately overliesa form supported by the arms at the upper end of post 65. Mix isdelivered into the hopper, in actual practice, by a conveyor belt 19 andthe operator is able to control the delivery 60 glass will usually be inof such mix into the mold at the spout 18.

After the block has been molded and set and the forms have been removed,its face is washed for reasons which will be made apparent hereinafterin connection with a more specific description of the method ofmanufacture. The apparatus employed for washing the block is shown inFigs. 3 and 4. A turntable 8|) is mounted on a vertical shaft 8| drivenby worm gear 82 and worm gear 83 to rotate slowly. The turntable an isof suflicient size to receive, without crowding, adjacent its periphery,four separate blocks, consecutive blocks being at right angles to eachother as indicated by the three blocks illustrated in Fig. 3. The spaceat 84 which is vacant in Fig. 3 65 represents a station from whichcompleted blocks are removed and to which blocks requiring washing areapplied to the table.

Behind the table is a column 85 carrying a' cross shaft 86 power drivenby pulley 88. Bevel 7o gearing at 89 (Fig. 3) transmits motion from thiscross shaft to a vertical shaft 90 which operates a worm gear 8| on theshaft 82 to drive the worm 62 previously referred to.

A pair of arms ll pivoted to the column II substantially co-axially withthe cross shaft Ill, carry the brush shafts ll driven by belts 91 fromthe cross shaft l6 and carrying brushes 88. Each of the arms II has anut intermediate its end in which there is threaded a screw 88 bearingagainst a projection III] of the column as a means of determining theheight of the arm and the degree of pressure engagement of therespective brushes 88 with the work passing therebeneath on turntable8B.

Supplied with water by the hoses Ill are the flushing nozzles I02, eachof which preferably has a plurality of orifices directed upon thebrushes 88 and the work.

Our improved method of manufacturing building blocks is as follows:

The face of each pallet, immediately prior to its use, is painted with apreparation which retards or prevents the setting of the cementimmediately contiguous to the pallet face without destroying thesmoothness of the block resulting from contact of the mix with thepallet face. In practice this preparation may be applied with a brush.While various materials may be employed, we have used satisfactorily amixture made by adding to 15 gallons of boiling water and 40 pounds ofglue dissolved therein, pounds of slaked lime. This preparation retardsbut does not completely prevent the setting of the cement. Itsconsistency is about that of paint when applied.

The form units each comprising one side and one end of the completeform, are now assembled upon the pallet and clamped together. The palletand form units are placed upon the head supports 15 carried by thevertically retractible post above the vibrating table 46 as shown inFig. 2.

For a rough block it would be possible immediately to fill the form withconcrete. However, assuming that it is desired to produce an ornamentalblock having facing areas of slightly diflering colors or textures orboth, the procedure is as follows:

The facing materials are previously mixed. As an aggregate we havesuccessfully used separately and in combination, crushed granite,marble, limestone, and glass, together with cement coloring and marbledust. The crushed stone and the form of small chips. Three parts of suchan aggregate are mixed with one part of cement, either light or dark orboth, according to the color of facing desired. Two or three differentcolors of mix may be used in the 65 facing of a single building block.

To make up the mix for facing the block, 1 bags of the aforesaidaggregate are mixed with a half bag of cement and 2 gallons of water. Aseparate batch of this character is required for each separate color tobe used.

We provide suitable masks for each of the areas delineated by the sidesof the form units and the ribs 12 on the face of the pallet. In thedisclosed structure there are three such areas at I05. I05 and Ill!respectively, (Figs. 6 and 7). A mask to fit each area may readily bemade of a piece of wood or other material, at least as thick as the ribsl2 and accurately fitted into the appropriate area. With two such areascovered by suitable masks the third area is filled with facing materialto the desired depth, which is preferably greater than the thickness ofthe ribs i2. Then one of the masks is removed and the second area isfilled with facing mix of desired color to a like depth. The last maskis then removed and the 7 third area is filled with facing mix ofdesired color to the same depth.

As soon as all of the facing material has been introduced into the mold,the operator immedlately steps on the pedal 68 and lowers the palletinto contact with the arms ill of the vibrating table for anextremelyshort period which, in actual practice, is only a matter of two or threeseconds. Thereupon the foot pedal 68 is released immediately and thesprings 61 again elevate the mold out of contact with the vibratingtable to the position shown in Fig. 2.

The core forms Ill are now introduced to span the mold transversely asshown in Fig. 5, and the mold is filled with cinder concrete mix. Someof the mix may be introduced before the core forms are inserted, ifdesired. The cinder concrete mix we preferably use employs an aggregatemade up of cinders, both large and small, and limestone dust, mixed withcement in the ratio of ten parts of cinders and dust to one part ofcement. Each batch of mix uses 10 bags of the aforesaid aggregate and 1bag of cement to 7% gallons of water. The limestone dust is omitted inmaking small size blocks but is preferably used in making 12" blocks orlarger. Blast furnace slag may be used to replace the cinders.

The above proportions, while not extremely critical, are neverthelesssomewhat critical if the best results are desired. The proportions maybe varied within certain limits according to the nature of the materialsused. A specific example has been given for the reason that thoseskilled in the art will appreciate that the batch above described willproduce a mix which is too soft for use in accordance with prior artpractices to permit immediate removal of the mold. If such a mix ismerely introduced into the mold and treated in the customary manner withor without tamping, and the sides of the mold are removed immediatelyfrom the pallet, the mix is so soft that it will slough, or sag, orcollapse in most instances. However, in accordance with our improvedmethod no such difficulty is experienced. During the filling of the moldwith the mix, the pedal 68 is depressed by the operator to lower thefilled mold onto the arms ill of the vibrating table and the pallet isallowed to remain in contact with the table for a matter of only a fewseconds, or until the mold is completely filled. In practice, onlytwelve to eighteen seconds is required to fill the mold and noadditional period of vibration is necessary.

While the specific time interval is not extremely critical, it iscritical in the sense that if the vibration is either too fine in degreeor too short or too long as to time, the material will not pack in sucha manner as to permit immediately removal of the forms from the castblock. The object is to introduce into the mix as much water as possibleso as to provide proper moisture for the complete set of the cement toproduce a hard block having desired waterproof characteristics. Withwater present in the approximate amounts indicated in the above formula,it has already been noted that without vibration, or if the vibration isinadequate in degree or time, the soft concrete mix will sag when theforms are removed. With the proper amount of vibration both in degreeand in time there will be no sagging and each block will be perfect.However, if the vibration is too much prolonged, instead of firmlypacking the mix, it will ultimately separate out the water to produce anexcess of water in certain portions of the block, with the result thatsagging will again occur. There is, therefore, a moderately criticalrelation between the amount of water used and the extent and time ofvibration. The extent of vibration could be diminished or the time couldbe greatly increased or greatly reduced if less water were used but, asalready stated, inadequate water does not permit proper setting of thecement and therefore a major achievement of the present inventionconsists in the use of greater quantities of water than had heretoforebeen possible to use where the form was disassembled immediately afterthe casting of the block.

For convenience in description, we designate mixtures containing theabove described water content as "wet-plastic mixtures," to distinguishthem from those above described as being too dry or too wet.

The pallet is immediately removed from the head post 65 and the moldunits are immediately released by manipulation of the cam levers 25 andare thereupon promptly taken from the molded block which, still mountedon its pallet, is stored for curing.

The vibration has brought all portions of the mix into intimate contactwith the pallet and the form and, apparently through the mechanicalinteraction of the particles, their adhesion to each other is soenhanced by the vibration that a mix too soft to stand immediate formremoval without vibration is so stable as readily to permit of formremoval following vibration of the prescribed character.

Where the cover plates 30 are used at the ends of the forms as shown inFigs. 5' and 6, the finished block will have recesses 300 in theconventional manner. Its face will have a relatively solid finish ply atH0 scored with grooves l I I and I I! produced by the ribs ii on thepallet. The various areas defined by such grooves will, in practice,preferably be slightly difierent in color or texture or both, as abovedescribed. The body of the block at Iii will preferably be relativelylight in weight, being preferably made of cinder or slag concrete. Itwill have the conventional openings at 6 provided by the core forms Ml.

Where a corner block is desired, as shown in Fig. 9, at least one of theend forms 30 will be removed and the plates 32 and 35 shown in Fig. '1will be substituted. The plate 32 provides the finished end surface atH3. The procedure involves the filling of the form with rough cinderconcrete mix, followed by the introduction of the finish mix into thespace between plates 32 and 35 followed, finally, by the withdrawal ofplate 35 whereby the continued vibration to which the block is subjectduring the filling operation, intimately unites the finish coating at H8with the cinder concrete body 5 to produce the structure shown in Flg.9. It will be noted that plate 35 does not extend to the pallet Hi5,thus permitting the union of the end finish coating H8 with the finishcoating previously deposited on the pallet.

Due to the mixture of glue and lime with which the pallet has beenpainted, the surface portion of the mix which would otherwise adhere tothe pallet, is precluded from setting during the period required for thecuring of the body of the block. Consequently the block will be hard anddry enough to remove from the pallet while its surface contiguous to thepallet is still soft. This makes the pallet easy to clean in preparationfor further use, and it facilitates removal or the block from the palletwith no tendency to destroy the finished surface of the block. It is,however, necessary or desirable to remove from the otherwise completedblock that surface portion which still remains soft. This is done on themachine shown in Figs. 3 and 4.

As above explained, a workman loads the turntable 80 at station 84 andthe slow rotation of the turntable counter-clockwise as viewed in Fig.3, brings each successive block first beneath one of the brushes 98where it is washed with clear water, and then beneath the other of thebrushes 98 where the washing operation is repeated. Two washes areemployed to remove all traces of the unset mix, leaving the block sosurfaced as closely to resemble natural stone.

Assuming that it is desired to make half blocks or quarter blocks orthree-quarter blocks, the form may be sub-divided by partitions (notshown) for which grooves or channels are provided at H8, H9 and I20above the center lines of the respective core forms, and at i2l, I22 andI23 below the center lines of the respective core forms. It will readilybe apparent to those skilled in the art how suitable partition stripsmay be introduced by the operator into the grooves in the opposite sidesof the mold both above and below the core form at which it is desired todivide the block.

The apparatus and method here disclosed are adapted for relatively highspeed production of building blocks. In actual practice each workman canproduce a complete block every two minutes. The number of form unitsrequired is only one set per workman and yet the blocks have just ashigh a quality as if they were allowed to become completely cured beforeremoving their forms. This is entirely attributable to the fact that thevibration permits the use of a concrete mix which would otherwise bemuch too wet to permit of form removal.

The very desirable finish of the faces of the blocks, however, isfurther attributable to the procedure just described whereby there is noadhesion f the mix to-the pallet and the intimate contact of theaggregate with the pallet which is the result of the vibration remainsat the surface of the completed block'to provide a very smooth andhighly regular surface even after the thin film of unset cement, lime,and glue, is washed away.

The particular nature and construction of the mold further contributesto the high quality of the block and the Speed with which it may beproduced. The fact that the mold is made up of two identical units eachcomprising one side and one end of the mold, each unit being providedwith clamping means readily engageable with the other, and the unitsbeing supported from the pallet in the manner indicated, all these arevery desirable features contributing to the successful operation ofmolds of this character.

We claim:

1. In a machine for making concrete blocks, the combination of vibratoryand non-vibratory mold supports, respectively, provided with mountingmeans upon which said supports are relatively movable, the non-vibratorysupport having a head adapted to carry a concrete form, and the other ofsaid supports being provided with means for receiving said form in thecourse of relative movement between said supports, means forcontinuously vibrating said form-receiving support, and means foractuating one of said supports bodily with respect to the other in adirection to transfer the weight of a concrete form the like, thecombination with a form supporting table and means for continuouslyvibrating the table, of an adjacent support, a concrete form providedwith portions adapted to rest upon the support and having other portionsfree of said support in positions for engagement with said table, andmeans for producing bodily relative movement between said support andtable in a direction to deposit said form upon said table, and means forproducing relative movement between said support and table in a conversedirection to lift said form from said table.

3. In a machine for making concrete blocks, the combination with a formsupporting table, and cushion means thereon. a table supported on saidcushion means for vibration respecting said frame, means forcontinuously vibrating the table. an adjacent support having a portionoverlapping a part of the table, a, vertically. reciprocable post uponwhich said support is mounted, means providing a guideway in which saidpost is vertically reciprocable, means biasing said post and support inan upward direction, and means for depressing said post against its biasto a position for depositing on said table subject to the vibrationthereof a concrete form carried by said support.

4. In a machine for making concrete blocks and the like, the combinationwith a form supporting table having a resilient mounting and means forcontinuously vibrating the table, of an adjacent support, means guidingsaid support for vertical movement, said support having a portionoverlapping the table, and a concrete form mounted on the support in aposition overlying the table and having portions free of said supportfor table engagement upon the downward movement of said support.

5. The combination with a concrete mold comprising a pallet, form meansupon the pallet, and supporting bars below the pallet, of a headincluding a set of arms in supporting relation to the pallet betweensaid supporting means, bars mounting and guiding said head for up anddown motion, a spring biasing said head for upward motion, said headbeing depressible against the bias by an operator, a vibrating tablehaving a portion positioned beneath said pallet supporting bars forengagement thereby. a frame provided with a resilient mounting for saidtable, and means for continuously vibrating said table whereby said moldmay be subjected to vibration when deposited on said table by thelowering of said head.

6. The combination with a table and means for continuously vibrating thetable, of an adjacent support, means for producing relative movement ofsaid table and support respecting each other in a direction to transfera. load from one to the other, said table and support being adapted toreceive a mold normally resting on one thereof and adapted to betransferred to the other upon the occurrence of such relative movement.

7. The combination ,with relatively vibratory and non-vibratorysupporting means adjacent each other and mechanism carrying one of saidmeans for relative movement in an upright direction with respect to theother, of motion transmitting connections including continuouslyoperable mechanism for vibrating the vibratory means, and motiontransmitting connections for actuating the carrier to move the supportcarried thereby bodily between two positions respecting the 11 othersupport, both 01 said supports being adapted to sustain a given moldwhich in one of said positions of said carrier will rest upon one ofsaid supports and in the other position or said carrier will be liftedtherefrom to rest upon the other of said supports.

8. The combination with a vibratory table and an adjacent table, saidtables being alternatively available for carrying a form in whichconcrete or the like is to be molded. each of said tables being disposedbeneath said form in operative supporting relation thereto, means iorcontinuously vibrating the vibratory table, and means for moving one ofsaid tables bodily in a generally vertical direction with respect to theother for a distance suflicient to efl'ect a. transfer of the weight ofthe form from one of the tables to the other, the form being sustainedby the table moved vertically when such vertically movable table is inan elevated position and being deposited upon the 20 12 other table whenthe vertically movable table is in a depressed position.

9. The device of claim 8 in which the table second mentioned is thetable movable in a vertical direction, said second mentioned tablehaving means for eii'ecting its vertical movement respecting thevibratory table.

10. The device oi! claim 8 in which the table second mentioned is thevertically movable table, said vertically movable table beingnonvibratory and provided with manually controlled means for itsgenerally vertical movement, said nonvibratory vertically movable tablehaving means biasing it in an upward direction and of sufllcientstrength to be adapted to lift the mold from the vibratory table, themold being deposited on the vibratory table only when the nonvibratorytable is depressed against such bias.

EUGENE LEIPOLD. BRUNO GARNI.

Certificate of Correction Patent No. 2,413 109.

December 24, 1946.

EUGENE LEIPOLD ET AL.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Column 10,line 45, claim 5, for means, bars read bars, means and that the saidLetters Patent should be read with this correction therein that the samemay conform to the record of the case in the Patent Office.

Signed and sealed this 25th day of March, A. D. 1947.

LESLIE FRAZER,

First Assistant Oommissioner of Patents.

11 other support, both 01 said supports being adapted to sustain a givenmold which in one of said positions of said carrier will rest upon oneof said supports and in the other position or said carrier will belifted therefrom to rest upon the other of said supports.

8. The combination with a vibratory table and an adjacent table, saidtables being alternatively available for carrying a form in whichconcrete or the like is to be molded. each of said tables being disposedbeneath said form in operative supporting relation thereto, means iorcontinuously vibrating the vibratory table, and means for moving one ofsaid tables bodily in a generally vertical direction with respect to theother for a distance suflicient to efl'ect a. transfer of the weight ofthe form from one of the tables to the other, the form being sustainedby the table moved vertically when such vertically movable table is inan elevated position and being deposited upon the 20 12 other table whenthe vertically movable table is in a depressed position.

9. The device of claim 8 in which the table second mentioned is thetable movable in a vertical direction, said second mentioned tablehaving means for eii'ecting its vertical movement respecting thevibratory table.

10. The device oi! claim 8 in which the table second mentioned is thevertically movable table, said vertically movable table beingnonvibratory and provided with manually controlled means for itsgenerally vertical movement, said nonvibratory vertically movable tablehaving means biasing it in an upward direction and of sufllcientstrength to be adapted to lift the mold from the vibratory table, themold being deposited on the vibratory table only when the nonvibratorytable is depressed against such bias.

EUGENE LEIPOLD. BRUNO GARNI.

Certificate of Correction Patent No. 2,413 109.

December 24, 1946.

EUGENE LEIPOLD ET AL.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Column 10,line 45, claim 5, for means, bars read bars, means and that the saidLetters Patent should be read with this correction therein that the samemay conform to the record of the case in the Patent Office.

Signed and sealed this 25th day of March, A. D. 1947.

LESLIE FRAZER,

First Assistant Oommissioner of Patents.

